Active practice pools

The original five cities per Big Four country are preserved. Added cities are ordered by archive frequency, then alphabetically. The 5 / 10 / 15 choices apply per country for The Big Four and per region for the other selections.

• Australia: 15 cities (10 added).
• Brazil: 12 cities (7 added; only 12 verified cities in this archive snapshot).
• China: 15 cities (10 added).
• Russia: 15 cities (10 added).
• Africa: 15 primary cities plus 23 additional repeated cities = 38.
• Central Asia: 15 primary cities; additional pool excluded.
• North America: 15 primary cities plus 61 additional repeated cities = 76.
• South America excluding Brazil: 15 primary cities; additional pool excluded.

Extreme Mode: 201 cities. Every session draws five distinct cities; Repeat keeps the same five in the same order.

All the Hits includes each expanded primary pool and any remaining cities appearing at least twice. No Big Four country has additional repeated cities beyond its expanded primary pool in the January 1–October 21 snapshot.

Research and previous lists are retained. The historical South America additional file is not included in active gameplay. Country frequency files contain daily source links; practice-pool files show the retained five plus additions. big-four-counts.json preserves the compiled Big Four counts. original-big-four.json preserves the original city pool. scripts/build-practice-data.py builds practice-data.js from the saved source data.